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First of all, make sure it has tappets. In our country, Toyota Conquests have overhead camshafts, which means they don't have tappets. The camshafts drive the valves down with cam followers - these are metal caps on the valves that run directly against the cams. These caps are either self-adjusted hydraulically, or set by inserting shims inside the caps.

Tappets......... perhaps is what your friend said. The tappets are part of the engine inlet and exhaust valve set up. Most tappets are self adjusting in modern motors, (Hydraulic).
The old fashioned tappets are manually adjusted during regular car servicing. This happens at set intervals, for instance every 20,000 miles.
Inlet valves allow air and fuel into the engine and exhaust valves let the burnt fuel and air out.
Tappets are fitted between the inlet and exhaust valves, they ensure that the valves open on time and more importantly close properly. If the tappet happened to be badly adjusted and did not let the valve close properly then damage to the valve and cylinder head can happen by burning.
If you have a significant power loss I would be surprised to find that the just tappets/valves were to blame.

If you have adjustable tappets the setting are usually .010" hot inlet and .12" hot exhaust. Start at 12 and 14 cold and recheck when hot. If you have hydraulic tappets there is no adjustment as they automatically adjust when oil pressure is achieved

The tappet clearence should be in the owners handbook but it's a bit early a tappet noise from the engine (2006) ! Check oil level and change if it's overdue a service is definately worth a look ! Good luck

When setting tappets, it has to be born inind that the valve stem wears an indentation into the face of the rocker. This prevents a really accurate tappet adjustment, so the customer is right again. If you do not posess a tappet setting dial gauge, a normal engineers dial gauge will do just as well. The procedure is the same as using your feeler gauge except that you set the dial gauge up on the cylinder head with the pointer resting on the head of the rocker. Press down fairly firmly on the rocker valve end and zero the gauge. Next lift up on the rocker and read off the clearance, from the gauge, Use a magnetic base to support your gauge and repeat the pocedure for each valve pair.